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It makes a lot of sense to shorten rather than heighten a screen to get out of buffeting. I am not sure you will find a shorter one for the S and you may have to pick up a used stocker and experiment with cutting it down yourself much as I had to do to find a screen I liked for the XR

I find that with the stock screen the wind blast hits me mid chest which makes it quite noisy at level.

If I raise myself a few inches higher, my head is in clear air and in a quiet zone.

I'm confused. If the wind blast off the screen is hitting you mid-chest, then that should put your helmet above the wind blast, and therefore in clear (albeit fast-moving) air. My goal is to have the wind blast hit me mid-chest (as opposed to my helmet), which is why I went with the Z-Technik dark screen when I wanted a tinted screen, because it has the same shape as the OE clear screen.

Quote:

Originally Posted by MVR London

I've noticed that if I put my arm across my chest it get much quieter.

Do you ride with a tank bag? Your arm across your chest is helping fill in the open space between the wind screen and your body, and preventing/reducing noise-generating turbulence in that area.

I figure the turbulent air from the top of the windscreen is hitting me in the chest which leads to a rumbling sound in the helmet

If I put my hand across my chest, this rumbling goes away.

If I raise myself off the seat a few inches, this rumbling goes away.

This rumbling is what I'm trying to eliminate.

No tank bag most of the time, though I do use one for longer trips.

This is starting to sound like a thread we had awhile back about reducing helmet noise. I think it ended without consensus resolution.

If the wind blast off the wind screen is really hitting you mid-chest (as opposed to your upper chest and neck area), then I don't think it is the cause of your rumbling sound. And so a lower wind screen is not going to solve it. Next time you ride at speed, try adjusting the angle of your head/helmet and see it that has any effect on noise. I have found that the noise in my Shoei Neotec varies with the angle of attack into the airstream.

Stock BMW K13 wind screens are very expensive . Be sure to take advice given and find a junker to mess with. I'd look at your helmet brand, (which is even more expensive. )
And, I hope you are using ear plugs, foam helps if inserted properly.

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I change your tires, you buy them on the web, I do the work $40, trying to keep riders on the road.

This is starting to sound like a thread we had awhile back about reducing helmet noise. I think it ended without consensus resolution.

If the wind blast off the wind screen is really hitting you mid-chest (as opposed to your upper chest and neck area), then I don't think it is the cause of your rumbling sound. And so a lower wind screen is not going to solve it. Next time you ride at speed, try adjusting the angle of your head/helmet and see it that has any effect on noise. I have found that the noise in my Shoei Neotec varies with the angle of attack into the airstream.

I have 2 different helmets and the same issue with both. And I have tried moving my head around - sound changes but does not go away.

Stock BMW K13 wind screens are very expensive . Be sure to take advice given and find a junker to mess with. I'd look at your helmet brand, (which is even more expensive. )
And, I hope you are using ear plugs, foam helps if inserted properly.

I'm just going to buy an aftermarket screen (something around €100) and cut that to start with. I think 1 or 2 companies make replacements that are the same as the factory ones.

I've got good ear plugs, and the new Schuberth C4 helmet. I also have a BMW System 6.